JOYFULL:
Good afternoon. I would like to tell you what the keeper of the SACHERTORTE has said 11 years ago. His name is Chefkonditor Friedrich Josef Pliegler. The chocolate covering is a FONDANT. The chocolate has a high degree of cocoa butter ( My opinion only probably 75% C/butter at minimum.) It is a combination of chocolate that comes from Austria, France, & Germany. Each one BITTER. THIS CONCOCTION IS poured over the torte & three (3) strokes are applied (Only 3 ). Then smoothed out along the sides. Then it is left to cool. All this comes from the horses mouth. One more thing he does mention that the eggs are separated, the whites most likely are beaten & then folded in. The world class European pastry bakers fold in their whites differently then we do. I have learned that much on my own. It is a much superior method.
Joyfull I hope this helps you bake the cake you are hoping for.
Good luck with it & enjoy the rest of the day young lady.
Z~BESTUS.
SIDURI:
The reason you found the torte dry is because the real torte after the cake has been sliced it is then applied with apricot preserves & is left to soak for 2 days. This way the apricot taste & moister go all the way thru. Then the glaze goes on.